# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0321542         0.0150413    
     0.460000          0.700000         0.0560179        0.00807085    
     0.700000           1.00000         0.0617621        0.00790795    
      1.00000           1.54000         0.0609288        0.00700484    
      1.54000           2.40000         0.0473167         0.0101918    
      2.40000           10.0000         0.0452275         0.0110268